incremental vs increment

incremental is not a noun while increment is a noun.

Word	Noun	Adjective	Verb	Adverb
incremental	No	Yes	No	No
increment	Yes	No	No	No

incremental (noun)	increment (noun)
	the amount by which something increases
	a process of becoming larger or longer or more numerous or more important

incremental (adjective)	increment (adjective)
increasing gradually by regular degrees or additions